Import attributes for acorn.
Parses to the experimental Import Attributes ESTree extension.
Supports both the with and deprecated assert keywords. Both are parsed to the same tree structure. A property attributesKeyword is added to expose which keyword was present in the source.
npm install @bojavou/acorn-import-attributesimport * as acorn from 'acorn'
import importAttributes from '@bojavou/acorn-import-attributes'
const Parser = acorn.Parser.extend(
importAttributes({ with: true, assert: true })
)
const source = `
import config from 'config.json' with { type: 'json' }
`.trim()
const tree = Parser.parse(source, {
ecmaVersion: 'latest',
sourceType: 'module'
}){
type: 'Program',
body: [{
type: 'ImportDeclaration',
specifiers: [..],
source: ..,
attributesKeyword: 'with',
attributes: [{
type: 'ImportAttribute',
key: { type: 'Identifier', name: 'type' },
value: { type: 'Literal', value: 'json' }
}]
}]
}
The default export is a factory function which produces a plugin. Pass an options object to configure which keywords to recognize.
Options
| Name | Type | Description | Default |
|---|---|---|---|
with |
boolean |
Recognize with as an import attributes keyword. |
true |
assert |
boolean |
Recognize assert as an import attributes keyword. |
false |
Extensions to the Import Attributes ESTree structure. attributesKeyword is null when no attributes are present.
extend interface ImportDeclaration {
attributesKeyword: "with" | "assert" | null;
}extend interface ExportNamedDeclaration {
attributesKeyword: "with" | "assert" | null;
}extend interface ExportAllDeclaration {
attributesKeyword: "with" | "assert" | null;
}
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